Behind Every Code.
There’s a Cause.
Aftertreatment faults, regeneration problems and derate conditions can interrupt the entire workday. HD Diesel Pros diagnoses emissions-system concerns to understand what is happening before recommending repairs.
Diagnose the system behind the warning.
Regeneration Problems
Recurring regeneration concerns need a closer look at the conditions and faults affecting the aftertreatment system.
Sensors & Faults
NOx and temperature sensor faults are evaluated in the context of the system, rather than treated as a parts list.
Derate Conditions
Reduced-power warnings can involve multiple systems. Share the messages and symptoms so we can plan the diagnosis.
What We Help With
- DPF systems
- DEF systems
- SCR systems
- EGR systems
- NOx sensors
- Temperature sensors
- Regeneration problems
- Derate conditions
- Check-engine faults
- Emissions faults
Get past the fault code.
Tell us what the dash is showing, when the problem started and whether the vehicle is in a derate condition.